If using Incremental build - only build changed modules and job is then build without changes to modules (manually started or changes to common files) hudson.ivy.changedModules property is passed with empty value to ant:

Building project with Ant Builder
[common] $ ant -file common.xml -Dhudson.ivy.changedModules= -Dsome.property=123 -Dsome.other.property=abc build-all -d

This results invalid setting of properties:

Setting ro project property: hudson.ivy.changedModules -> -Dsome.property
Setting ro project property: some.other.property -> abc

This could be fixed passing '' for hudson.ivy.changedModules property if there isn't any changed modules.